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Grinding process for the production of nanofibrillated cellulose based on unbleached and bleached bamboo organosolv pulp
Department of Biosystems Engineering, Faculty of Animal Science and Food Engineering, University of São Paulo.
Department of Biosystems Engineering, Faculty of Animal Science and Food Engineering, University of São Paulo.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Department of Materials and Technology, Faculty of Engineering, São Paulo State University.
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Number of Authors: 62016 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 23, no 5, p. 2971-2987Article in journal (Refereed) Published
Abstract [en]

Nanofibrillated cellulose (NFC) is a type of nanomaterial based on renewable resources and produced by mechanical disintegration without chemicals. NFC is a potential reinforcing material with a high surface area and high aspect ratio, both of which increase reinforcement on the nanoscale. The raw materials used were unbleached and bleached bamboo organosolv pulp. Organosolv pulping is a cleaner process than other industrial methods (i.e. Kraft process), as it uses organic solvents during cooking and provides easy solvent recovery at the end of the process. The NFC was produced by treating unbleached and bleached bamboo organosolv pulps for 5, 10, 15 and 20 nanofibrillation cycles using the grinding method. Chemical, physical and mechanical tests were performed to determine the optimal condition for nanofibrillation. The delamination of the S2 layer of the fibers during nanofibrillation contributed to the partial removal of amorphous components (mainly lignin), which have low polarity and improved the adhesion of the fibers, particularly the unbleached cellulose. The transverse modulus of elasticity of the unbleached NFC was highest after 10 nanofibrillation cycles. Further treatment cycles decreased the modulus due to the mechanical degradation of the fibers. The unbleached NFC produced by 10 cycles have a greater transverse modulus of elasticity, the crystallite size showed increase with the nanofibrillation, and after 5 nanofibrillation cycles, no differences are observed in the morphology of the fibers.

Place, publisher, year, edition, pages
2016. Vol. 23, no 5, p. 2971-2987
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-4305DOI: 10.1007/s10570-016-0996-9ISI: 000382634300016Scopus ID: 2-s2.0-84976497151Local ID: 23c9f3d0-93d1-48c4-aa3c-15db8ab11506OAI: oai:DiVA.org:ltu-4305DiVA, id: diva2:977169
Note

Validerad; 2016; Nivå 2; 2016-10-18 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Sain, Mohini

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